One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(18,24)(19,28)(20,30)(22,23)(25,31)(29,32) involution — undirected(2,5)(6,8)(9,10,12,14)(11,15,16,13)(17,18)(19,29)(20,25)(21,24)(22,26)(23,27)(28,31)(30,32)(9,11,12,16)(10,13,14,15)(17,19,21,20)(18,25,24,29)(22,30,23,28)(26,31,27,32)(1,3,4,7)(2,6,5,8)(17,20,21,19)(18,25,24,29)(22,30,23,28)(26,32,27,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.